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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* util/support/dir_filenames.c - fetch filenames in a directory */
/*
* Copyright (C) 2018 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "k5-platform.h"
void
k5_free_filenames(char **fnames)
{
char **fn;
for (fn = fnames; fn != NULL && *fn != NULL; fn++)
free(*fn);
free(fnames);
}
/* Resize the filename list and add a name. */
static int
add_filename(char ***fnames, int *n_fnames, const char *name)
{
char **newlist;
newlist = realloc(*fnames, (*n_fnames + 2) * sizeof(*newlist));
if (newlist == NULL)
return ENOMEM;
*fnames = newlist;
newlist[*n_fnames] = strdup(name);
if (newlist[*n_fnames] == NULL)
return ENOMEM;
(*n_fnames)++;
newlist[*n_fnames] = NULL;
return 0;
}
static int
compare_with_strcmp(const void *a, const void *b)
{
return strcmp(*(char **)a, *(char **)b);
}
#ifdef _WIN32
int
k5_dir_filenames(const char *dirname, char ***fnames_out)
{
char *wildcard;
WIN32_FIND_DATA ffd;
HANDLE handle;
char **fnames = NULL;
int n_fnames = 0;
*fnames_out = NULL;
if (asprintf(&wildcard, "%s\\*", dirname) < 0)
return ENOMEM;
handle = FindFirstFile(wildcard, &ffd);
free(wildcard);
if (handle == INVALID_HANDLE_VALUE)
return ENOENT;
do {
if (add_filename(&fnames, &n_fnames, ffd.cFileName) != 0) {
k5_free_filenames(fnames);
FindClose(handle);
return ENOMEM;
}
} while (FindNextFile(handle, &ffd) != 0);
FindClose(handle);
qsort(fnames, n_fnames, sizeof(*fnames), compare_with_strcmp);
*fnames_out = fnames;
return 0;
}
#else /* _WIN32 */
#include <dirent.h>
int
k5_dir_filenames(const char *dirname, char ***fnames_out)
{
DIR *dir;
struct dirent *ent;
char **fnames = NULL;
int n_fnames = 0;
*fnames_out = NULL;
dir = opendir(dirname);
if (dir == NULL)
return ENOENT;
while ((ent = readdir(dir)) != NULL) {
if (add_filename(&fnames, &n_fnames, ent->d_name) != 0) {
k5_free_filenames(fnames);
closedir(dir);
return ENOMEM;
}
}
closedir(dir);
qsort(fnames, n_fnames, sizeof(*fnames), compare_with_strcmp);
*fnames_out = fnames;
return 0;
}
#endif /* not _WIN32 */
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